While some Atlas users are internationally mobile, the dominant use case for Delaware entities is to give you a convenient box the system knows how to interface with while you live and operate your business wherever you live and operate your business. This is true for foreign and U.S.-based owners of Delaware entities.
One of my favorite Atlas users, Meitre in South America, has this tagline on their site: "Proudly born in Uruguay. Made with love in California" Much of their business is in South America; they went on (after incorporation) to through YC, raised from A16Z, etc. I think their experience is a userful counter to the standard narrative about brain drains, because that business is very thoroughly South American and also a first-class participant in the SV ecosystem.
Anecdotally speaking, a lot of the Atlas companies I'm aware of which raised money raised it either primarily locally, a mix of local and Silicon Valley, or "extremely widely distributed."